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Question

Two tall buildings are 80 m apart. The velocity with which a ball should be thrown horizontally from a window 95 m above the ground in one building so that it will enter a window 15 m above the ground in the second building is : (g=10 m/s2)

A
15 m/s
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B
5 m/s
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C
10 m/s
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D
20 m/s
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Solution

The correct option is D 20 m/s
Range =80 m
Height =80 m
uv=0
S=80 m
a=10 m/s2
80=012×10×t2t=4 sec

Range =u×t
u=Ranget=804=20 m/s

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